[[1.0.5] TAC Life Support v0.11.2.1 [12Dec]]

Thanks! Here we go (call it something like "TACLS_CTT.cfg"):

@PART[TacAirFilter|TacWaterPurifier|TacWaterPurifierLarge]:NEEDS[CommunityTechTree,TechManager]
{
    @requiredTech = recycling
}

@PART[TacCarbonExtractor|TacCarbonExtractorLarge|TacSabatierRecycler|TacSabatierRecyclerLarge|TacWaterSplitter]:NEEDS[CommunityTechTree,TechManager]
{
    @requiredTech = enhancedSurvivability
}

I put the filter/purifier parts under "Recycling", and the various reactors under "Enhanced Survivability". I was okay with leaving the big storage units in "Heavy Rocketry" since that's pretty much required for long-term missions anyway.

If this makes sense to you, feel free to include it in your next release!

You should submit a pull request on his github page.